JP4488537B1 - Label separator for plastic containers - Google Patents

Abstract

A plastic container is rotated and fed into needles provided in a large number of protrusions in a cylinder, thereby easily and inexpensively separating a resin-based label attached to or pasted on the plastic container.
A polygonal rotator 12 provided in an axial center portion of a cylindrical body 11 to which a plastic container is supplied and a rectangular side surface of each of the polygonal rotators 12 are arranged in parallel with each other at a predetermined inclination angle. A pair of first and second rotary blade blade portions 13 and 14 and a plurality of fixed needle portions 15 projecting to a predetermined length inside the cylindrical main body so as to restrict the movement of the plastic container. It was.
[Selection] Figure 1

Description

  The present invention relates to a plastic container label separating apparatus for separating and collecting labels attached to or pasted from containers when recycling plastic containers such as polyethylene terephthalate and polyester. .

  Conventional plastic containers include those made of polyethylene terephthalate, vinyl chloride, polyethylene, and polypropylene. These plastic containers such as plastic bottles are made of resin or paper such as PVC, PE, PP, etc., which is formed of a material different from the container main body and printed on the surface for display of product names and contents. A label is attached or pasted and distributed in the market.

  These used PET bottles and the like are collected separately, and by separating useful plastic materials such as polyethylene terephthalate from the collected PET bottles and the like, utilization of fiber regeneration and the like is promoted. When these plastic containers are separated and reused by resin, it is necessary to remove the attached or affixed labels and separate them from the plastic containers. As a method for separating a label from a plastic container body, a method in which a plastic container mechanically crushed is peeled off in a cleaning solution or the like, or a wind force is separated by a difference in specific gravity is proposed.

For example, Patent Document 1 (Japanese Patent Laid-Open No. 10-15495) proposes a method in which a PET bottle is charged and pulverized into an apparatus in which a plurality of crushing chambers are arranged in series, and separated according to the specific gravity of each member. .
Japanese Patent Laid-Open No. 10-15495

Further, in Patent Document 2 (Japanese Patent Laid-Open No. 9-192523), a plastic bottle is roughly crushed from a coarse crusher, a metal material is removed by a metal removing device, and the flakes from which the metal has been removed are finely crushed. A method has been proposed.
JP 9-192523 A

Furthermore, Patent Document 3 (Japanese Patent Application Laid-Open No. 8-151438) proposes a method of recovering each component by decomposing a pulverized product in a glycol liquid.
JP-A-8-151438

  However, in Patent Documents 1 and 2 in which the plastic container is crushed by the conventional mechanical means, the label remains in the crushed plastic piece and the label separation process is often insufficient. Since many processes are required, there has been a problem that costs such as total equipment costs and running costs increase.

  In addition, in the method of treating with glycol of Patent Document 3, reliable separation can be expected, but the treatment cost associated with the glycol liquid is large, making it difficult to apply.

The present invention has been developed to solve such problems. That is, an object of the present invention is to easily and inexpensively separate a resin-based label or the like attached to or pasted on a plastic container by feeding the plastic container while rotating it onto needles provided in a large number of projections in a cylinder. It is an object of the present invention to provide a label separating apparatus for plastic containers.

  (1) A plastic container label separating apparatus according to the present invention for solving the above problems is a plastic container label separating apparatus (10) for separating a label attached to or attached to a plastic container such as a plastic bottle, A cylindrical main body (11) provided with a supply port (11a) for supplying a plastic container at the top and a discharge port (11b) for separating and discharging the processed plastic container at the bottom, and the cylindrical main body (11 ) And a polygonal rotating body (12) that is driven to rotate at a predetermined rotational speed via a driving unit, and a predetermined inclination on each rectangular side surface of the polygonal rotating body (12). A pair of first and second rotary blade blade portions (13, 14) that are arranged parallel to each other at an angle and sequentially contact with the label surface of the plastic container as it is rotated, and the polygon The cylindrical body (11) protrudes to a predetermined length so as to restrict the movement of the plastic container that is transferred between the outer side of the cylindrical rotating body (12) and the inner side of the cylindrical body (11). A plurality of fixed needle portions (15) are provided.

  (2) In the present invention, the polygonal rotating body (12) is a regular hexagonal rotating body whose cross section is formed in a regular hexagon, and protrudes from each rectangular side surface of the regular hexagonal rotating body (). The height of the first rotary blade blade part (13, 14) is also lower than the height of the second rotary blade blade part (13, 14).

  (3) The present invention provides a rotary blade blade portion (12) of the polygonal rotating body (12) according to the type, size and supply amount of the plastic container supplied to the supply port (11a) of the cylindrical body (11). 13, 14) is characterized in that the protruding length of the fixed needle portion (15) opposed to the adjustable needle portion (15) can be adjusted.

  (4) In the present invention, an air duct (24) for sucking and discharging the label piece peeled off from the plastic container is connected to the label piece outlet (23) provided at the upper part of the cylindrical body (11). Also has a feature.

  According to the present invention, the cylindrical main body (11) provided with the supply port (11a) for supplying the plastic container at the top and the discharge port (11b) for separating and discharging the processed plastic container at the bottom. The polygonal rotating body (12) provided at the axial center of the cylindrical main body (11) and driven to rotate at a predetermined rotational speed via the driving unit, and the polygonal rotating body (12). A pair of first and second rotary blade blade portions (13, 14) arranged in parallel with each other at a predetermined inclination angle on the rectangular side surface and sequentially abutting on the label surface of the plastic container as it is rotated, and the polygonal shape A plurality of protrusions projecting to a predetermined length on the inner side of the cylindrical body (11) so as to regulate the movement of the plastic container transferred between the outer side of the rotating body (12) and the inner side of the cylindrical body (11). Fixed needle part (15 Preparative, since with the label, such as a mounting or pasted paper or resin-based, such as plastic bottles can be easily separated and removed. That is, a plastic container label is provided on the cylindrical main body (11) by the rotary blade blades (13, 14) of the polygonal rotating body (12) that is rotationally driven provided on the cylindrical main body (11) serving as a casing. It can be peeled off in cooperation with the fixed needle part (15), and even if PET bottles compressed and deformed into various shapes are put into the cylindrical body (11) and mixed, The attached label can be separated and collected.

In particular, by rotating the polygonal rotating body (12) in the cylindrical body (11) in which a large number of fixed needle portions (15) are arranged, the first rotating blade blade section (13) and the second rotation are rotated. The gap between the plastic container caught on the blade blade part (14) and the fixed needle part (15) changes. By changing the gap, the plastic container can easily rotate,
If a tear is made in the label piece by the rotary blade part (13, 14) or the fixed needle part (15), the label piece can be easily peeled by this rotation.

  Thus, the purity of plastic containers such as waste plastic bottles to be recycled can be increased in advance, and the rotary blade blade parts (13, 14) for crushing the plastic bottles are stored in the cylindrical body (11). Since the plastic bottle and the label piece to be crushed are not scattered around, the separation operation can be performed safely and hygienically.

  In the case where the air duct (24) is connected to the label piece outlet (23) provided in the cylindrical main body (11), the label piece having a small mass is sucked from the air duct (24), and the plastic container having a large mass is sucked. Can be easily separated by dropping from the discharge port (22).

  Furthermore, the process of selecting the plastic material from the waste plastic bottle can be omitted, and only the PET material contained in the waste plastic bottle can be decomposed at low cost. Moreover, only a label can be isolate | separated, maintaining the original bottle shape, and it can process at a subsequent process as a plastic material more than the magnitude | size crushing using a rough crusher etc. Thereby, even if it is weak wind power, the separation ability of a coarse weight piece and a coarse and lightweight piece can be improved, and the removal rate of an unnecessary coarse and lightweight piece can be improved. In this way, it is possible to construct a waste plastic processing system that is excellent in energy efficiency, maintainability, and mass processing by applying a plastic container label separator.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view of a plastic container label separating apparatus according to a first embodiment of the present invention. It is side surface sectional drawing of the label separation apparatus of Example 1. FIG. FIG. 3 is a partially enlarged view of the label separating apparatus according to the first embodiment. It is explanatory drawing which shows arrangement | positioning of the rotary blade blade part of the label separation apparatus of Example 1. FIG. It is explanatory sectional drawing which shows the positional relationship of the operation state of the polygon-shaped rotary body in a cylindrical main body, and a plastic container, (a) is a state in which a plastic container is in a wide gap, (b) is in a gap in which a plastic container is narrow. In a certain state, (c) is a state in which the plastic container is moved. It is front sectional drawing which shows the label separation apparatus of Example 2 provided with the separation structure of the peeled label piece and a plastic container. It is a front view which shows a series of facilities comprised from the label separation apparatus of Example 2. FIG.

  The plastic container label separating apparatus according to the present embodiment is a plastic container label separating apparatus that peels and separates a label attached to a plastic container such as a plastic bottle, and a supply port to which the plastic container is supplied The upper part is provided with a cylindrical body provided with a discharge port at the bottom for separating and discharging the processed plastic container, and the shaft core part of the cylindrical body is rotated at a predetermined rotational speed via the drive part. A pair of first and second polygonal rotators that are arranged in parallel with each other at a predetermined inclination angle on the respective rectangular side surfaces of the polygonal rotator and that sequentially contact the label surface of the plastic container as it is driven to rotate. The movement of the plastic container transported between the second rotary blade blade part, the outer side of the polygonal rotating body, and the inner side of the cylindrical body is regulated. It is constructed inside the serial cylindrical body and a plurality of fixing needles portion projecting from the predetermined length.

As a result, the plastic container is transferred to the gap between the inner side of the cylindrical body and the outer side of the polygonal rotating body via the fixed needle part. The first and second rotary blade blades of the polygonal rotating body that is rotationally driven can be brought into contact with the label surface of the plastic container and can be peeled off in cooperation with the fixed needle provided on the cylindrical body, The purity of waste plastic bottles to be recycled can be increased in advance by efficiently processing the bottles without breaking them and maintaining their original shapes.

  The label separating apparatus for plastic containers is applied to a waste plastic processing system for recovering useful plastic materials from recycled plastic waste containers. Waste plastic containers containing polyethylene terephthalate, etc. are treated with a label separator and then washed with water or chemicals. The pulverized product containing a large amount of moisture is dehydrated by centrifugation and finally dried. To become a plastic raw material.

  The cylindrical body whose inside is formed in a cylindrical shape is a horizontally mounted fixed casing portion whose axis is in the horizontal direction, a supply port to which a waste plastic container is supplied, and a plastic material after separation processing Are provided at the upper and lower portions of the housing portion, respectively.

  The polygonal rotator is a rotator having a regular polygonal cross section such as a quadrangle, hexagon, or octagon, and is provided at the axial core portion of the cylindrical main body with a predetermined rotational speed via a motor drive unit, For example, it is rotationally driven at a rotational speed of 50 to 300 rpm, preferably 120 to 240 rpm.

The first and second rotating blade blade portions are portions having a substantially rectangular blade portion that comes into contact with and peels off the label surface of the plastic container, and the rotation is performed on each rectangular side surface of the polygonal rotating body. They are arranged parallel to each other at an inclination angle of about 10 to 30 degrees with respect to the axis of the body.
Thus, the second rotary blade blade part is configured to sequentially abut after the first rotary blade blade part comes into contact with the plastic container as the polygonal rotating body rotates.

  The fixed needle portion is provided with a metal pin having a diameter of 1 to 3 mm and the like, and a plurality of tips thereof are arranged toward the inside of the cylindrical body, and are transferred between the outer side of the polygonal rotating body and the inside of the cylindrical body. It has a function to regulate the movement of the plastic container. That is, the plastic container put into the supply port of the cylindrical main body is locked by a fixed needle portion protruding and fixed to the inside of the cylindrical main body with a predetermined length, and driven relative to the fixed needle portion. A pair of rotary blade blades is used to pierce a label attached to a plastic container, and a tear is formed there, which can be used as an opportunity to be efficiently peeled off.

  Further, in the plastic container label separating apparatus according to the present embodiment, the polygonal rotator is a regular hexagonal rotator whose cross section is formed in a regular hexagon, and each rectangular shape of the regular hexagonal rotator. A height of the first rotary blade blade part protruding from the side surface may be lower than a height of the second rotary blade blade part. As a result, the label attached to the plastic container can be peeled or scraped off more efficiently and reliably. In this embodiment, a regular hexagonal columnar shape is applied as the polygonal rotating body arranged in the cylindrical main body. However, for example, an octagonal columnar shape or a rectangular columnar shape can be appropriately applied. is there.

  The difference (H2−H1) between the height H1 of the first rotary blade blade portion protruding from the rectangular side surface of the polygonal rotary body and the height H2 of the second rotary blade blade portion is 2 to 10 mm, preferably It is desirable to set in the range of 4-8 mm.

Furthermore, the plastic container label separating apparatus according to the present embodiment is provided on the rotary blade blade portion of the polygonal rotating body according to the type, size, and supply amount of the plastic container supplied to the supply port of the cylindrical body. It is possible to adjust the protruding length of the fixed needle portions facing each other. This makes it possible to appropriately set the operating environment between the cylindrical main body and the polygonal rotating body for the various miscellaneous plastic containers collected that change from day to day. The label separation process can be efficiently performed without increasing the number.

  As a protrusion length adjusting mechanism for the metal pin or the like in such a fixed needle portion, for example, a spiral groove is cut in an inner pipe for fixing the metal pin, and the metal pin is directed to the polygonal rotating body by screw rotation. A rotary screw adjustment type for feeding or a knock type adjustment type in which the built-in structure advances and retreats by pushing the knock button provided at the base end and pushes the core metal pin to the tip side can be applied. .

1 is a partially cutaway front view of a label separating apparatus for a plastic container according to a first embodiment of the present invention. FIG. 2 is a side sectional view of the label separating apparatus according to the first embodiment. FIG. 3 is a partially enlarged view of the label separating apparatus according to the first embodiment.
Next, Embodiment 1 of the present invention will be described with reference to the drawings. Note that in the drawings referred to below, the same portions or portions having similar functions are denoted by the same reference numerals, and detailed description thereof is omitted.
The plastic container label separating apparatus 10 according to the first embodiment includes a cylindrical main body 11 and a polygonal rotating body 12. The cylindrical main body 11 is configured such that a plastic container is supplied from a supply port 11a provided at the top thereof, and a plastic material is separately discharged from a discharge port 11b at the bottom thereof. For example, the inner diameter D1 is about 700 mm, The length is about 2000 mm.
The polygonal rotating body 12 is provided, for example, on the shaft core portion of the cylindrical main body 11 and is rotationally driven via a rotation driving unit 12a such as an electric motor, and has a maximum outer diameter D2 of about 500 mm.

As shown in FIG. 1, the outer peripheral surface of the polygonal rotating body 12 whose cross section is formed in a regular hexagonal shape is constituted by, for example, six rectangular side surfaces (length: about 2000 mm, width: about 120 mm), A plurality of pairs of first rotary blade blade portions 13 and second rotary blade blade portions 14 are provided on each rectangular side surface, and an angle of about 15 degrees with respect to the axis of the cylindrical main body 11. Are arranged parallel to each other.
In this way, by arranging the rotary blade blade portions 13 and 14 with a predetermined inclination angle, the plastic container such as a plastic bottle supplied from the supply port 11a is placed along the axial direction of the cylindrical main body 11. It can be transported.

  The polygonal rotating body 12 is provided at a horizontal position serving as the axis of the cylindrical main body 11 via a bearing portion 12b, and is driven at a rotation speed of about 120 rpm by a rotation driving unit 12a provided with an electric motor. . In addition, the lower side of the cylindrical main body 11 formed in a substantially cylindrical shape is provided with a discharge port 11b through which the processed material is discharged. And the waste plastic discharged | emitted from the discharge port 11b is sequentially crushed as needed.

FIG. 4 is an explanatory diagram showing the arrangement of the rotary blade blade part of the label separating apparatus according to the first embodiment.
As shown in FIG. 4, the first rotary blade blade part 13 and the second rotary blade blade part 14 are, for example, labels attached to the surface of a plastic container to be put in a substantially prismatic shape with an overall length of about 80 mm. It is a blade part for making it contact | abut. The first rotary blade blade portion 13 and the second rotary blade blade portion 14 are attached to the respective rectangular side surfaces of the polygonal rotary body 12 via two bolt-shaped locking members 16.

Further, the blade portions of the first rotary blade blade portion 13 and the second rotary blade blade portion 14 are, for example, as shown in FIGS. 2 and 3, the protruding height from the rectangular side surface to which each is attached is H1 = 55 mm, H2 is set to 61 mm.
Thus, as the polygonal rotating body 12 rotates, the first rotating blade blade portion 13 is first brought into contact with the surface of the plastic container to peel off the label, and then the remaining label is removed from the second rotating blade blade. The part 14 is supplemented and peeled off.

  In addition, a large number of fixings that can be adjusted to a predetermined length are provided on the inner side of the cylindrical body 11 so as to restrict the movement of the plastic container that is transferred between the outer side of the polygonal rotating body 12 and the inner side of the cylindrical body 11. A large number of needle portions 15 are arranged in a substantially lattice pattern at a predetermined interval (for example, in a range of 5 to 10 cm).

  The fixed needle portion 15 includes a projecting length adjusting mechanism for projecting the metal pin 15 a with a predetermined length toward the inside of the cylindrical main body 11. Accordingly, the protruding length of the metal pin is linked to the rotational speed of the polygonal rotating body 12 by the rotation driving unit 12a according to the supply amount, the type, and the size of the plastic container supplied to the cylindrical main body 11. Is adjusted accordingly.

  In this way, the plastic container is locked by the fixed needle portion 15 inside the cylindrical main body 11 and the pair of rotary blade blade portions 13 and 14 driven relative to the fixed needle portion 15 are used to attach the plastic container to the plastic container. The attached label is stabbed, and a tear is formed there, which triggers and efficiently peels off. The plastic container can be separated from the container body by peeling off only the label while keeping the original form without crushing.

As shown in FIG. 4, the transfer blade 17 formed in a substantially rectangular parallelepiped shape having a length of 300 mm and a width of 50 mm is formed on each rectangular side surface of the polygonal rotating body 12 immediately below the supply port 11 a of the cylindrical main body 11. Are arranged at an inclination angle of 45 degrees with respect to the axis of the cylindrical main body 11, and the plastic container introduced from the supply port 11 a of the cylindrical main body 11 is swung along the axial direction of the cylindrical main body 11. However, it is made to transfer toward the discharge port 11b.

The label made of this plastic material is mounted so as to be wound around the plastic container main body by the heat shrinkage, and can be easily separated from the container main body by tearing a part thereof.
Thus, when a plastic container with a label attached thereto is inserted into the supply port 11 a of the plastic container label separating apparatus 10, the plastic container is received by the transfer blade 17 of the polygonal rotating body 12 and the axial direction of the cylindrical body 11. Next, the label attached to the outer surface of the plastic container is peeled off by the rotational force of the first and second rotary blade blade parts 13 and 14 and transferred toward the discharge port 11b. The peeled label piece or plastic container can be drawn toward the discharge port 11b.

FIG. 5 is an explanatory sectional view showing the positional relationship between the operation state of the polygonal rotating body in the cylindrical main body and the plastic container, (a) is a state where the plastic container is in a wide gap, (b) is a state where the plastic container is A state in a narrow gap, (c) is a state in which the plastic container is moved.
In the present invention, by rotating the polygonal rotary body 12 provided with the first and second rotary blade blade portions 13 and 14 within the cylindrical main body 11 in which a large number of fixed needle portions 15 are arranged, Separate the label strip from the plastic container. The plastic containers caught by these many fixed needle portions 15 are moved in a space where the gaps between the first and second rotary blade blade portions 13 and 14 change (FIG. 5 ( a) to (c)). The plastic container is easily rotated by changing the gap. Therefore, when a tear is made in the label piece by the first and second rotary blade blade parts 13 and 14 or the fixed needle part 15, the label piece can be easily peeled by the rotation of the plastic container.

  Further, a plurality of sets of label separating devices 10 for plastic containers as described above may be provided so that label pieces that have not been separated and sucked can be separated by the following separating device. Thus, the label stripping mechanism can be further increased to further increase the removal rate of the label pieces.

FIG. 6 is a front sectional view showing a label separating apparatus of Example 2 having a structure for separating a peeled label piece and a plastic container.
The label separating apparatus 21 of Example 2 was provided with two discharge ports. The first place is a plastic container discharge port 22 provided at the bottom of the cylindrical main body 11 on the transfer side in the axial direction as described above. The plastic container from which the label piece has been peeled is discharged from the plastic container discharge port 22. A plastic container having a large mass falls from a hopper provided in the plastic container discharge port 22.

  The second discharge port is a label piece discharge port 23 provided at the upper part of the cylindrical body 11 on the transfer side in the axial direction. The label piece peeled from the plastic container is sucked and discharged from the label piece discharge port 23 by the air duct 24. At this time, since the mass of the plastic container is large, it falls from the discharge port 22 for the plastic container. On the other hand, the peeled label piece having a small mass is discharged from the label piece discharge port 23 by suction of the air duct 24. Thereby, it can sort into a plastic container and a label piece. The plastic containers and label pieces thus separated can be further finely pulverized using another pulverization apparatus (not shown) according to the contents, thereby producing plastic raw materials having various desired dimensions.

FIG. 7 is a front view showing a series of facilities constituted by the label separating apparatus of the second embodiment.
The cylindrical main body 11 provided with the second outlets 22 and 23 is equipped with facilities as shown in the figure. A space for placing a packing bag or a collection box for collecting the crushed plastic container is formed below the plastic container discharge port 22. A belt conveyor (not shown) may be disposed below the plastic container discharge port 22. In this way, a large amount of plastic containers can be collected by using the belt conveyor.

  An upward-facing vertical air duct 24 was connected to the label piece outlet 23 of the cylindrical main body 11. The vertical air duct 24 is provided with a window 25 for observing the internal situation. A section bend 26 was connected to the vertical air duct 24, and a spiral duct 27 that was freely bent was connected to the section bend 26. A suction blower 28 is provided at the tip of the spiral duct 27 via a dust collecting hose 29. The label piece is collected by the cyclone 30 at the tip of the suction blower 28, filled in the packing bag 31, and brought into a state where it can be transported.

  The present invention is not limited to the embodiment of the invention described above, and the plastic container is attached to or attached to the plastic container by feeding it while rotating the plastic container into the fixed needle portions 15 protruding in the cylindrical main body 11. Of course, as long as the resin-based label can be easily and inexpensively separated, it is not limited to the configuration shown in the figure, and various changes can be made without departing from the scope of the present invention.

As described above, according to the present invention, a polygonal rotating body that is rotationally driven is provided on the axial core portion of a cylindrical body to which a plastic container is supplied, and the plastic container is provided on each rectangular side surface of the polygonal rotating body. Attached to plastic bottles, etc. by providing a pair of rotary blade blade parts that sequentially contact the label surface as it rotates, and a plurality of fixed needle parts projecting to a predetermined length inside the cylindrical body The gist of the present invention is to easily and inexpensively separate the resin-based label and the like.
The present invention can be widely applied as part of a resource recycling technique for removing and separating and recovering labels attached to plastic containers such as polyethylene terephthalate and polyester.

  According to the present invention, by cooperating the rotating blade blade part of the polygonal rotating body and the fixed needle part installed in the cylindrical main body, it has various shapes and is indiscriminately deformed and compressed. Even if the waste plastic container is mixed and charged, the container body and the labels can be separated and recovered.

  In other words, the label attached to the plastic container body by heat shrink of the resin film or adhesive can be securely peeled off without breaking the plastic container, and the label can be peeled off from plastic containers of various shapes and sizes. Can be done efficiently. Therefore, it is possible to simplify the various processing steps when increasing the purity of the plastic piece obtained by crushing the waste plastic container from which the label has been separated and to recycle it, thereby reducing the overall processing cost.

10 Plastic container label separator (Example 1)
DESCRIPTION OF SYMBOLS 11 Cylindrical main body 11a Supply port 11b Discharge port 12 Polygon-shaped rotary body 12a Rotation drive part 12b Bearing part 13 1st rotary blade blade part 14 2nd rotary blade blade part 15 Fixed needle part 15a Metal pin 16 Locking member 17 Transfer blade 21 Plastic container label separator (Example 2)
22 Plastic container outlet 23 Label strip outlet 24 Air duct

Claims (4)

A plastic container label separating apparatus (10) for separating a label attached to or attached to a plastic container such as a plastic bottle,
A cylindrical body (11) provided with a supply port (11a) to which the plastic container is supplied at the top and a discharge port (11b) from which the processed plastic container is separated and discharged at the bottom;
A polygonal rotating body (12) which is provided at an axial center portion of the cylindrical main body (11) and is driven to rotate at a predetermined rotational speed via a driving section;
A pair of first and second rotary blades that are arranged in parallel to each other on the rectangular side surfaces of the polygonal rotating body (12) at a predetermined inclination angle and that sequentially contact the label surface of the plastic container as it is rotated. Part (13, 14),
Projecting to a predetermined length on the inside of the cylindrical body (11) so as to restrict the movement of the plastic container transferred between the outside of the polygonal rotating body (12) and the inside of the cylindrical body (11). A plastic container label separating apparatus comprising a plurality of fixed needle portions (15).   The polygonal rotating body (12) is a regular hexagonal rotating body whose cross section is formed into a regular hexagon, and the first rotating blade blade portion protruding from each rectangular side surface of the regular hexagonal rotating body. The label separating apparatus for a plastic container according to claim 1, wherein the height of (13, 14) is lower than the height of the second rotary blade blade (13, 14).   Opposite the rotary blade blade part (13, 14) of the polygonal rotating body (12) according to the type, size and supply amount of the plastic container supplied to the supply port (11a) of the cylindrical body (11). The label separating apparatus for a plastic container according to claim 1, wherein the protruding length of the fixed needle portion (15) is provided so as to be adjustable.   An air duct (24) for sucking and discharging the label piece peeled off from the plastic container is connected to the label piece outlet (23) provided at the upper part of the cylindrical main body (11). The label separating apparatus for a plastic container according to claim 1 or 3.

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